class CreateReqRels < ActiveRecord::Migration
  def self.up
    create_table :req_rels, {:id=>false} do |t|
      t.column :req_from_id, :integer # req to derive
      t.column :req_to_id,   :integer # derivation
      t.timestamps
    end
  end

  def self.down
    drop_table :req_rels
  end
end
